Sommer (born September 6, 1946) is a Republican member of the Illinois House of Representatives, representing the 106th district since 1999.
Following the legislative map changes effective in 2012, Sommer is now serving the Illinois 88th district.
The 88th district includes the cities of Morton, Washington, and Bloomington.
Sommer previously served as a Tazewell County Board member from 1994 to 1998, Tazewell County Recorder of Deeds from 1984 to 1988, and a Morton Village Board member from 1977 to 1986.
His brother Roger Sommer served in the Illinois Senate.